1. Spread honey mustard dressing on bottom half of bun.
3. Top with tomato, brisket, mushrooms, cheese and crispy onions.
4. Cover sandwich with top of bun and serve.
Nutritional information per serving: Calories 726; Total Fat 31g; Saturated Fat 8g; Tran Fat 0; Cholesterol 134mg; Sodium 858mg; Total Carbohydrate 59g; Dietary Fiber 3g; Total Sugars 6g; Protein 52g